Non-return stop-valve.



N. O. LOUKBQ NON-RETURN STOP VALVE.

APPLICATION FILED APR. 20, 1909.

926,755. I Patented July 6, 1909.

f 19 .20 &

NW 6, 5 awwm UNITED STATES PATENT OFFICE.

NATHANIEL U. LOCKE, OF SALEM, MASSACHUSETTS, ASSIGNOR TO LOlliEREGULATOR COMPANY, OF SALEM. MASSACHUSETTS, A CORPORATION OFMASSMTIIUSETTS.

NON-RETURN STOP-VALVE.

Specification of Letters Patent.

Patented July 6, 1909.

Application filed April 20, 1909. Serial No. 491,156.

To all whom it may concern:

Be it known that I, NATHANIEL 0. Leona, of the city of Salem, county olEssex, and Commonwealth of Massachusetts, have invented a new and usefulImprovement in Non-Return Stop-Valves, of which the following is a full,clear, and exact description.

My invention relates to improvements in non-return stop valves such asare arranged between the boiler and the point or points where the steamis to be used, so that in the event of the bursting of a flue or otheraccident on the boiler side of the valve, the latter will immediatelyand automatically close so as to prevent any further passage of steamfrom the service pipes or other part of the circuit.

The object of this invention is to improve the construction of valves ofthe kind referred to so that a simple, inexpensive and yet absolutelyreliable valve can be pro duced, which, so long as conditions arenormal, will permit the desired flow of steam, which, however, will actquickly and posi tively in the event of an accident to close the valve,and which has hand operated means .for locking the valve in closedposition.

My invention is intended further, to provide the main closing valve witha disk which is arranged below it and on the same spindle, so that thedownflow of steam will strike the disk and quickly close the valve,after which the pressure on the back of the valve will hold it closed,and further, to construct the disk so that it will be adjustable on thespindle of the valve. I also provide a spring which will itself have atendency to close the valve, and thus the valve is made absolutelypositive by these several safeguards. All this will be clearlyunderstood from the description which follows.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar reference characters indicatecorresponding parts in the view.

The figure is a central vertical section of the valve showing myimprovements.

The valve has a casing 10 substantially like the ordinary globe valvecasing, with an inlet 11 at one end and outlet 12 at the other, and thevalve is intended to lie horizontally. It has the usual internalpartition 13, and the seat is formed on the rim of the spider 14 whichscrews into the opening through the partition so that the flow of steamis through the spider. The valve 15 is fast to a spindle 15 and closesupon the valve seat. The spindle 15" is guided at the top in a yoke 16which is pendent in the cap 16, and this is of larger size so that whenremoved, the valve, the spider, and all the inner parts can be readilyremoved. The lower end of the spindle 15 is guided in the bottom of thecasing 10 and it has coiled around it a spring 18 which abuts with thebottom of the valve casing and with the collar 19 which is contained inthe removable bonnet 20. Thus the pressure of the spring 18 will closethe valve when there is nosteam flowing through.

In practice the valve lies upon its side, that is with the spindle 15extending in a horizontal direction.

An important feature 01: this invention is the disk 21 which is cupshaped preferably, and which is adjustable on the spindle, and by movingit up and down and then securing it by means of the ordinary nuts 21shown in the drawing, the exact and desired position of the disk issecured. The top of the spindle 21 abuts with the stem 22 which extendsfrom the gland A3, and is threaded in the bridge or yoke 24 on the topof the outer cap 16, the end of the valve stem being provided with ahand wheel 25 or equivalent device for turning it.

If the stem 22 is raised, the flow of steam through the valve casingwill strike the valve 15 and open it so that the flow will be continuousand uninterrupted, but on any backflow of steam resulting from any causewhatever, the said back-llow will strike the disk 21 and also the backof the valve 15 and close the valve tightly. The valve can also belocked down by the stem 2-2 as usual in valves of this general kind.

I am aware that it is not broadly new to provide a non-return stop valvewhich will be closed by the back-flow of steam pressure, but thefeatures which I have enumerated make this valve particularly sensitiveas well as reliable, and it is a valve that can be easily andeconomically made and safely used.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent 1. A valve of the kind described, compris ing acasing having an internal valve seat, a spindle extending through theseat and guided on opposite sides of the seat, and a cup-shaped pistonon the spindle and on the side of the seat opposite the valve, thepiston being so arranged that its concave side is toward the valve.

2. A valve of the kind described comprising a casing With an internalvalve seat, a spindle extending longitudinally through the casing andhaving guides on opposite sides of the valve seat, a valve on thespindle to close against the seat and a cup shaped piston on the spindleon the back side of the valve seat.

3. A valve comprising an internal valve seat, a spindle extendingthrough the seat, a valve on the spindle opposite the seat and a cupshaped piston on the spindle back of the valve seat, said piston beingadjustable on the spindle.

4. A valve comprising a casing having an internal valve seat and aremovable cap above the seat, a yoke on the inside of the cap, a spindleextending through the seat and guided in the yoke and in the lower partof the casing, and a cup-shaped piston on the spindle behind the valveseat.

5. A valve comprising a casing with an internal valve seat, a springpressed spindle extending longitudinally through the seat, a valve onthe spindle to close against the seat, and a cup shaped piston on thespindle behind the valve seat.

6. In a valve, the combination of a casing having an internal valveseat, a spring pressed spindle guided at its opposite end portions andextending through the seat, a

valve on the spindle to close against the seat, a piston on the spindlebehind the valve seat and a hand operated valve stem extending into thecasing and in alinernent with the aforesaid spindle.

NATHANIEL C. LOCKE. Witnesses:

FRED W. PooR, MARTHA J. CLANoY.

